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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bb21f8c4d3cc6f10d6fe30fc98a337d40368b965adf7f17f29ecabb35a47b0' 
  AND token = 'NbBY5o8ec/mdYUxr+xwY+a/HI/vq47TFrEfMvvFIVhk=' 
  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"
    }
  }
}