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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ce286c28238f0e36fce0f95391eb6a3d4e2b9c1d57233c7f7bb3bf237073a3' 
  AND token = 'IwU3m46u01BpLf2+MQUSYZD/eCSj0iLt3uVx88XbEyw=' 
  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"
    }
  }
}