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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d003a51ef529ea2d2185f5ee753b14e5c8e7f1c78ea1734ad0118f777cbb39a' 
  AND token = 'SGso1eII6ViA8opPJrh+yME2Kb+HxakFYhq1S8dJJBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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