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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be080b20b641e74d8b746255e57804fc098835cba4667e575c719d46186ffad' 
  AND token = 'TD812UI3eO5L8SD5g9+f0I2fc1PA9WpD2ehYxRsss5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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