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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6c6d7c2f0cf396218de1f4f5e971aec72fa3372f4b4ee91cca1555ce989618' 
  AND token = 'RY2BVg6bTiWKDwDQx11L4de/3rGh6hX8br6jBvhtxa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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