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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc2916b4f1c16dbe002aec93b095f3d2d81a3225c91e2ece787b651cfbf4a6b' 
  AND token = 'h4V9LhEp2CPBb8VT9R2pjNDMT+7+xBAHW3Uf5b5U65U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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