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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2ef7cb3b08a502631056875682890b60c6681eae35e62bd91d2cb033b03926' 
  AND token = '13/Njwp0f1glDsf+BpdI5aM9rjD6RUlF991Uih8iK7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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