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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7e21e6532c17b1ea54ffffede829f288c69507e3b7422ce0a5d15551a5e86b' 
  AND token = 'nyss9f8K0ImInB/dut9YU9Ws2SS7xykmgMjLqI16oYE=' 
  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"
    }
  }
}