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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46c6cf8c128fe6b4b8874b95837f7116a61ce1fda5fbd2687aac22a9f9dd9dd' 
  AND token = 'VWn9UPBW+B6eO/XOAoUX5q4LiBVmF6mqX1sVx379Ixo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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