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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0769394b1b07df1ae54bc5bc8a38c3d8f43b18f3dbf98fc6fdf95d750e75c4' 
  AND token = 'aq7gyaBHFUGcXcqru6qW427PB3qK1MkXhXAYQz9NDYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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