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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ae0027b741db1b632805ad303f564ae435557a77dabb682078bf3544d63d57' 
  AND token = 'qQbOpn9GLa7NvqZ67S/L2l81OFv8zFJwSiSxHQvI0BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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