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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ceecbaf2197a07da263c7adc4dbdab0dfc9d422e86b038d3dd815ba80abcb4' 
  AND token = '/sSu2TbJeF+A4izjQodSwkEOL/b4mpEUMPQlkCmUMsE=' 
  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"
    }
  }
}