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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87cff69d2d13e4d8ddd6a726f9e6ed341fa903389a634a37504f30201d6cb1b6' 
  AND token = 'U2HlCj2yg6/JA4NkM2zVwHkKj6Lbg31lQRg8q5aGGIU=' 
  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"
    }
  }
}