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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3101fce2fee5cf516addce50ce6cc1f17784ba56bdf40ddd0c1b302e8df50a4' 
  AND token = 'e6i14/6RzPxQ4pdpCc86/ar7j/Ae+myjmTQWRjEnWc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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