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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b2de281055d33a63ff4899a2fd9c61a6028e1141cd9c61a7dc806a565fe3eb' 
  AND token = 'N2wE+swNqMPK4AcjHQzd9Q0yCdQYuAhOvptKK4r1OOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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