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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a83e4d96ef5bcc28b31b64412a1f56db3b55cea3bf6b92a55b7572d82ac69f9' 
  AND token = 'J/lIB9hTcvAzF5NAcxbieId7cK9s7T0fjcRvkhkcDYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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