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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ce5477abeed71a5d98389d64dd027012c52b4b4e6a03c1b7051a7e33eebdeb' 
  AND token = 'V+ketFAYHaasgx0SQQ1RLPaXzunM8fm9hw4jemzfJjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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