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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6ff3b28fb315ccb048a42676c3a6775de10180ca23a332b62cda346b97ddcc' 
  AND token = 'p+cpqo6nwWd9YO4kvSTRrx6itKLTdvbX8Q7CxKKD/gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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