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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04a6e78806808f12d5afb4fd138fb6e9f67a2520eae4e81efde56d9895c759b' 
  AND token = 'TzS7Qf9Thkau15cGbhUEBiLm4ppvnuE7kdvZTWN7L/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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