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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef3f7d86921f3335b78236a9805c589221f4c9be2d84cfc48afe00f60865994' 
  AND token = 'uOmhijT6gdJuq0HCKxtXppCA7AW27eVA2X6XIuYhXGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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