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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6b45b0e4af38f46da25340cbb916d438d7b1d167ab5681f81cd7647f0d3a83' 
  AND token = 'VYnTcSl2bJMcOPfSSLSriDOgSjDe4GQp0S5Yk90XcgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}