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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2840a4cfe3c1dda540bb0e3dddb39770c02f60b4fefb2bf32a10ab28f4961fa' 
  AND token = 'ybpmxb9AdIum96x//uuDKAY0bQPP9QXflzZNJSDu4Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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