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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f93d49764e7e4ab36f1709a671fc4f3962b709780106bb42b22211b3a507ad8' 
  AND token = 'PiV6L9otW2iqPhUmhwA8sQKcFv9BNAc38jFeMcdNVx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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