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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbe6ed46f0feabde346e7e98eac381f532b863e2e02c2fb5fb0a945b2b96b74' 
  AND token = 'BaZz4AoiYDmz6Kw39WQ0orVsWCWUf+k5NqTiS6NDvms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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