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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177bac7184775ba50f45282e9f9255bb5c892933d1e9c90b7ed294460e7531de' 
  AND token = 'hsL5Ixw5pyfZEDf+ATgTeVgD8YVrjuCZO6Fdt3jSk1I=' 
  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"
    }
  }
}