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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ee0939653b7ae82b882d8fea47cb8586add100bc41f8938361564f24c38a81' 
  AND token = 'O2lg5IuMV/zKo4diiPpyfz+EzyObEyMbksJYly/95kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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