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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c395f26ffb61b96399c64b6803b1276b8c2047e6f3791042644eae6389147852' 
  AND token = 'FdRLPb+J89DxPb/S/6vYjN+Sthv9ftOFUyKkcxhm/w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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