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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbe73755a4fe61ea587ebe39d6476f08c594849708cd61049d12e1650a43d79' 
  AND token = 'Et7oeE1uFiATpU2O2OB+i1R+GKGMCrYiNiuSHiDuylQ=' 
  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"
    }
  }
}