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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db5cbf8748c44dd39d47f6d24b9a0f405dd9b6b6d68ba409807f09521f7f1f1' 
  AND token = '9/w4GxCYVqtcnK5TDcw44JV1dAXFpbJXOaq2UiEw/c4=' 
  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"
    }
  }
}