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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2610b5ff9832c62409fd8a559d7d7cd7c0f4cf1a4d0554ef7e0d9df73b9c782' 
  AND token = '5knwTIR9K0PUCes+xg56dcFSv6JmQ1wxFL/4cicsqXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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