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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b80b172bb559879774dca2bd5de65df637d7b4ecef8549694f71b3ef0d4bbf' 
  AND token = 'PW8+hD+cl6zl6vmN6icQJnRHzdRLs127CsVr7qIK2dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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