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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ca6b6740a90340266f57296f11b46e508b41183faee815fe6768ad0e46edbb' 
  AND token = 'T47RIV486JuQyfIS+jqDOj3bWNIKkvt4CFPEu1se3wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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