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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887ff21020243bfaf7e1b67a426080ac4b5f84c31904be769308182dc4c84dde' 
  AND token = '4D5cUOjvbLR4Lc8dfd3YHVYXUIU/taGZvOsPiu8Xqhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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