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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6530d519309c9e2adf76c52997bf91e4b05aa110a3e096b4e8f620ee571e8ee' 
  AND token = 'OOKcl/bU4pS70kBXEETEcE8Idi6u4s8qtilXtRKndQc=' 
  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"
    }
  }
}