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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586c7a2ce9cd90e607ca884d459b390d10f8f56d292b643fde8ebdb095428468' 
  AND token = '5mxKFRD0XAuu2uY85Q80AVv8QuNa6bmNeUKJzNDCKzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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