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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35a94364cbd020228e6999aefebc44bf669f8c21bd209f4a8f910c47a9772e3' 
  AND token = 'cHtTomIikKcXHHj8Z7fwM/T6dISeMCGTAJ2SOf8Ffus=' 
  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"
    }
  }
}