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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386dfee821b4e77b6284646651178c68b59c8682d6a03ea028efd78cd10730ba' 
  AND token = '2FJVpHfcuJNykN5FuI168vsBDbkUmQvR2c3T98Ogt6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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