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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd5642d4db5d44b47e11d564591d0e1a5570884eb931168af8401519650e2ba' 
  AND token = 'De9InZWtTmSKizq+cx8iEI+pIg0HtcqE0gJwaUqnM+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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