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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2091b148b4e278f37469c425fc5b63b0fdf00f33676f03822e62e0f07ca5b6c2' 
  AND token = 'Myejrfn3aqWxU+S/+mRC2BG1BAMw5J25SthBME0a84U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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