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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece9d09a66784fa1f20f84d222864a2a009e343439c260916f6d28bc3e868744' 
  AND token = 'PPwdg7DzGH4FH2vBYroGWtErZiw84cLW+xO8fCKDe5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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