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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ffadeeb5c44fb9bdfaf32c0510cff2d0d927865ed41296e6f9c2efaf31034f' 
  AND token = 'b39FY/Tkw4ZtktNINGr9ylf0KO0DvYaDKFfQtTvXdQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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