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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f169b1f750296c7a9ab803c998b1319062ca368e5b8b9e2cdf4b8d40effaa7' 
  AND token = 'cZ7pGDWyD5uGdHw3RKZtfs0x1CjWx9PSI9YhoB03d8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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