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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce5b8c241e8bb6df23ed6f6920f2f27ff73e7713fe66718a11e73a508e391ca' 
  AND token = 'Ip8Oax5Z3xzJmprlV7vDMdqU42RVC6Uh/2Fgsl9H85M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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