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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a54c84012079319d62959ebc168fd5e3cd9958dfcf6217607ca785021b9eae0' 
  AND token = 'XinmPhO/AQ5iKP6ZxhSFMdnKeB7i3D++H43AggnFNeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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