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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9e7f541717be6033042b9725834d352fba4a94a96f1c9cd0310eb36c8bb0af' 
  AND token = '7FC15mu8kcCe4WmsSzP2CAk2gCEGXng4INkQ5fVrJ6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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