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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d289964627e5408b384420ec32da0414729091e7a7fff2fd39fd865b46e44e' 
  AND token = 'bMJ0ExwGscp18xZBQF9g1EYc0qrKH068ZVoHWVn3dHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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