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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1eba425f4b7af5ea5492a814311a179764ad6ce4ff7d2f184d554cda1975e13' 
  AND token = 'qHhiw7/vx6XX2B+14j7C9GZttA2zfSHVqThW7OUQ4Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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