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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871f206dc908372b439f0f7bebd1336e070d8255c77445ee0a01c2a99bc9b329' 
  AND token = 'Gzl6kAW5X08TLNDCsTbgzayWHP4JE3fPtxI6TXTk6rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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