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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe449231143ad2ddc58b3d1ed78df177a7e132175fcad94bd90318b2ed6b72c' 
  AND token = 'NrWSoHU3gVZNoLLnoestbVjSPycBNBPU/E1qRrc2eY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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